This is pretty old, and its more like "How you stopped playing Ironman in X-Com"...
So, playing Ironman Impossible. After 30 tries to pass the tutorial mission (which restarts with fresh characters every time you wipe) I finally get pass with an epic team, rocking around the first few missions and going strong. Get the first Slingshot Mission, sliding along the edge of the map taking things slow and shit. Thin Men and that Chryssalid start appearing all over the map...
Then I notice, the Chryssalid and Two Thin Men bunch together by accident, I had already peppered the Chryssalid with some fire before so it was low on health and the Thin Men were weak. My Heavy was perfectly positioned...
I fire my rocket, waiting for impact to woop in joy to the exploding corpses of these foolish aliens, the explosion starts, Connects with the Chryssalid's face, then stops, stalling, forever. The game Crashed... I WAS ANGRY, but hey its Ironman, it totally saved AFTER I fired the shot right... WRONG...
I come back into the game with my Heavy ready to fire, the shot lines up. THEN FIRES 100000m OFF IN THE OTHER DIRECTION!!! The Chryssalid goes next and then happily runs up and kills the VIP in one action... FAILURE...
I stopped playing Ironman from then on. I never savescummed during a fight though, just restarted the whole battle if a crash happens. Much happier...